1499257261 has 2 divisors, whose sum is σ = 1499257262. Its totient is φ = 1499257260.

The previous prime is 1499257169. The next prime is 1499257273. The reversal of 1499257261 is 1627529941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1442556361 + 56700900 = 37981^2 + 7530^2 .

It is an emirp because it is prime and its reverse (1627529941) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1499257261 - 2⁹ = 1499256749 is a prime.

It is a super-2 number, since 2×1499257261² = 4495544669322444242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1499258261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 749628630 + 749628631.

It is an arithmetic number, because the mean of its divisors is an integer number (749628631).

Almost surely, 2^1499257261 is an apocalyptic number.

It is an amenable number.

1499257261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1499257261 is an equidigital number, since it uses as much as digits as its factorization.

1499257261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 46.

The square root of 1499257261 is about 38720.2435555356. The cubic root of 1499257261 is about 1144.5252727128.

The spelling of 1499257261 in words is "one billion, four hundred ninety-nine million, two hundred fifty-seven thousand, two hundred sixty-one".